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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30214270791864c6ae6ee27cfc257bb0f4d0a086e81abafc0f212fab276568ee' 
  AND token = 'd03+8G4CtoxasST6IGU91Glg0s9h+cF8mBZq1G90d68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}